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It's the probability of all chances in a match being converted
Posted by machine on August 13, 2017, 12:10 am, in reply to "What's "expected goals" OPTA stat? I looked it up but was baffled by the..."
based on historical information (basically the number of times a shot in that specific position was scored or not). There's various models out there, so currently no specific figure can be termed correct or not, but here it's useful insomuch as it shows how good each team's chances were, which a simple count of Shots On/Off target fails to do.
In depth explanation below http://statsbomb.com/2017/08/xg-is-on-tv-now-what/
: ...official description. Just a rough
: description please...